The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 2017
Filed:
May. 22, 2013
Koninklijke Philips N.v., Eindhoven, NL;
Rajwinder Singh, Pleasanton, CA (US);
John Edward Epler, San Jose, CA (US);
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
The structural characteristics of the light-exiting surface of a light emitting device () are controlled so as to increase the light extraction efficiency of that surface () when the surface is roughened. A light emitting surface () comprising layers of materials with different durability to the roughening process exhibits a higher light extraction efficiency than a substantially uniform light emitting surface exposed to the same roughening process. In a GaN-type light emitting device (), a thin layer () of AlGaN material on or near the light-exiting surface () creates sharper features after etching compared to the features created by conventional etching of a surface comprising only GaN material.